The cytosolic isoform of triosephosphate isomerase, ZmTPI4, is required for kernel development and starch synthesis in maize (Zea mays L.)

Triosephosphate isomerase (TPI) is an enzyme that functions in plant energy production, accumulation, and conversion. To understand its function in maize, we characterized a maize TPI mutant, zmtpi4. In comparison to the wild type, zmtpi4 mutants showed altered ear development, reduced kernel weight...

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Published in:The Crop journal 2024-04, Vol.12 (2), p.401-410
Main Authors: Li, Wenyu, Wang, Han, Xu, Qiuyue, Zhang, Long, Wang, Yan, Yu, Yongbiao, Guo, Xiangkun, Zhang, Zhiwei, Dong, Yongbin, Li, Yuling
Format: Article
Language:English
Subjects:
Amylopectin
Amylose
Arabidopsis
Carbon dioxide
Chlorophyll
Chloroplasts
Cloning
Corn
ears
energy
Enzymes
Glycerol
Glycolysis
Kernel
leaf area
Leaves
Lipids
Localization
Maize
Metabolism
Mutants
Phosphates
Photosynthesis
Phylogenetics
Proteins
Pyruvic acid
seed development
seed weight
Seeds
Starch
starch granules
Triose-phosphate isomerase
Weight
Zea mays
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Summary:Triosephosphate isomerase (TPI) is an enzyme that functions in plant energy production, accumulation, and conversion. To understand its function in maize, we characterized a maize TPI mutant, zmtpi4. In comparison to the wild type, zmtpi4 mutants showed altered ear development, reduced kernel weight and starch content, modified starch granule morphology, and altered amylose and amylopectin content. Protein, ATP, and pyruvate contents were reduced, indicating ZmTPI4 was involved in glycolysis. Although subcellular localization confirmed ZmTPI4 as a cytosolic rather than a plastid isoform of TPI, the zmtpi4 mutant showed reduced leaf size and chlorophyll content. Overexpression of ZmTPI4 in Arabidopsis led to enlarged leaves and increased seed weight, suggesting a positive regulatory role of ZmTPI4 in kernel weight and starch content. We conclude that ZmTPI4 functions in maize kernel development, starch synthesis, glycolysis, and photosynthesis.
ISSN:2214-5141
2095-5421
2214-5141
DOI:10.1016/j.cj.2024.02.001